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SUSE:SLE-12-SP2:GA
gcc12.26411
gcc12-fifo-jobserver-support.patch
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File gcc12-fifo-jobserver-support.patch of Package gcc12.26411
From 1270ccda70ca09f7d4fe76b5156dca8992bd77a6 Mon Sep 17 00:00:00 2001 From: Martin Liska <mliska@suse.cz> Date: Tue, 9 Aug 2022 13:59:32 +0200 Subject: [PATCH 1/3] Factor out jobserver_active_p. gcc/ChangeLog: * gcc.cc (driver::detect_jobserver): Remove and move to jobserver.h. * lto-wrapper.cc (jobserver_active_p): Likewise. (run_gcc): Likewise. * opts-jobserver.h: New file. * opts-common.cc (jobserver_info::jobserver_info): New function. --- gcc/gcc.cc | 37 +++++-------------------------------- gcc/lto-wrapper.cc | 44 +++++++++----------------------------------- gcc/opts-common.cc | 41 +++++++++++++++++++++++++++++++++++++++++ gcc/opts-jobserver.h | 44 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 99 insertions(+), 67 deletions(-) create mode 100644 gcc/opts-jobserver.h diff --git a/gcc/gcc.cc b/gcc/gcc.cc index 5cbb38560b2..cac11c1a117 100644 --- a/gcc/gcc.cc +++ b/gcc/gcc.cc @@ -27,6 +27,7 @@ CC recognizes how to compile each input file by suffixes in the file names. Once it knows which kind of compilation to perform, the procedure for compilation is specified by a string called a "spec". */ +#define INCLUDE_STRING #include "config.h" #include "system.h" #include "coretypes.h" @@ -43,6 +44,7 @@ compilation is specified by a string called a "spec". */ #include "opts.h" #include "filenames.h" #include "spellcheck.h" +#include "opts-jobserver.h" @@ -9178,38 +9180,9 @@ driver::final_actions () const void driver::detect_jobserver () const { - /* Detect jobserver and drop it if it's not working. */ - const char *makeflags = env.get ("MAKEFLAGS"); - if (makeflags != NULL) - { - const char *needle = "--jobserver-auth="; - const char *n = strstr (makeflags, needle); - if (n != NULL) - { - int rfd = -1; - int wfd = -1; - - bool jobserver - = (sscanf (n + strlen (needle), "%d,%d", &rfd, &wfd) == 2 - && rfd > 0 - && wfd > 0 - && is_valid_fd (rfd) - && is_valid_fd (wfd)); - - /* Drop the jobserver if it's not working now. */ - if (!jobserver) - { - unsigned offset = n - makeflags; - char *dup = xstrdup (makeflags); - dup[offset] = '\0'; - - const char *space = strchr (makeflags + offset, ' '); - if (space != NULL) - strcpy (dup + offset, space); - xputenv (concat ("MAKEFLAGS=", dup, NULL)); - } - } - } + jobserver_info jinfo; + if (!jinfo.is_active && !jinfo.skipped_makeflags.empty ()) + xputenv (jinfo.skipped_makeflags.c_str ()); } /* Determine what the exit code of the driver should be. */ diff --git a/gcc/lto-wrapper.cc b/gcc/lto-wrapper.cc index 795ab74555c..1e8eba16dfb 100644 --- a/gcc/lto-wrapper.cc +++ b/gcc/lto-wrapper.cc @@ -37,6 +37,7 @@ along with GCC; see the file COPYING3. If not see ./ccCJuXGv.lto.ltrans.o */ +#define INCLUDE_STRING #include "config.h" #include "system.h" #include "coretypes.h" @@ -49,6 +50,8 @@ along with GCC; see the file COPYING3. If not see #include "lto-section-names.h" #include "collect-utils.h" #include "opts-diagnostic.h" +#include "opt-suggestions.h" +#include "opts-jobserver.h" /* Environment variable, used for passing the names of offload targets from GCC driver to lto-wrapper. */ @@ -1336,35 +1339,6 @@ init_num_threads (void) #endif } -/* Test and return reason why a jobserver cannot be detected. */ - -static const char * -jobserver_active_p (void) -{ - #define JS_PREFIX "jobserver is not available: " - #define JS_NEEDLE "--jobserver-auth=" - - const char *makeflags = getenv ("MAKEFLAGS"); - if (makeflags == NULL) - return JS_PREFIX "%<MAKEFLAGS%> environment variable is unset"; - - const char *n = strstr (makeflags, JS_NEEDLE); - if (n == NULL) - return JS_PREFIX "%<" JS_NEEDLE "%> is not present in %<MAKEFLAGS%>"; - - int rfd = -1; - int wfd = -1; - - if (sscanf (n + strlen (JS_NEEDLE), "%d,%d", &rfd, &wfd) == 2 - && rfd > 0 - && wfd > 0 - && is_valid_fd (rfd) - && is_valid_fd (wfd)) - return NULL; - else - return JS_PREFIX "cannot access %<" JS_NEEDLE "%> file descriptors"; -} - /* Print link to -flto documentation with a hint message. */ void @@ -1422,7 +1396,6 @@ run_gcc (unsigned argc, char *argv[]) bool jobserver_requested = false; int auto_parallel = 0; bool no_partition = false; - const char *jobserver_error = NULL; bool fdecoded_options_first = true; vec<cl_decoded_option> fdecoded_options; fdecoded_options.create (16); @@ -1653,14 +1626,14 @@ run_gcc (unsigned argc, char *argv[]) } else { - jobserver_error = jobserver_active_p (); - if (jobserver && jobserver_error != NULL) + jobserver_info jinfo; + if (jobserver && !jinfo.is_active) { /* Fall back to auto parallelism. */ jobserver = 0; auto_parallel = 1; } - else if (!jobserver && jobserver_error == NULL) + else if (!jobserver && jinfo.is_active) { parallel = 1; jobserver = 1; @@ -1971,9 +1944,10 @@ cont: if (nr > 1) { - if (jobserver_requested && jobserver_error != NULL) + jobserver_info jinfo; + if (jobserver_requested && !jinfo.is_active) { - warning (0, jobserver_error); + warning (0, jinfo.error_msg.c_str ()); print_lto_docs_link (); } else if (parallel == 0) diff --git a/gcc/opts-common.cc b/gcc/opts-common.cc index 8097c058c72..4d4f424df13 100644 --- a/gcc/opts-common.cc +++ b/gcc/opts-common.cc @@ -17,6 +17,7 @@ You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ +#define INCLUDE_STRING #include "config.h" #include "system.h" #include "intl.h" @@ -25,6 +26,7 @@ along with GCC; see the file COPYING3. If not see #include "options.h" #include "diagnostic.h" #include "spellcheck.h" +#include "opts-jobserver.h" static void prune_options (struct cl_decoded_option **, unsigned int *); @@ -2005,3 +2007,42 @@ void prepend_xassembler_to_collect_as_options (const char *collect_as_options, obstack_1grow (o, '\''); } } + +jobserver_info::jobserver_info () +{ + /* Detect jobserver and drop it if it's not working. */ + string js_needle = "--jobserver-auth="; + + const char *envval = getenv ("MAKEFLAGS"); + if (envval != NULL) + { + string makeflags = envval; + size_t n = makeflags.rfind (js_needle); + if (n != string::npos) + { + if (sscanf (makeflags.c_str () + n + js_needle.size (), + "%d,%d", &rfd, &wfd) == 2 + && rfd > 0 + && wfd > 0 + && is_valid_fd (rfd) + && is_valid_fd (wfd)) + is_active = true; + else + { + string dup = makeflags.substr (0, n); + size_t pos = makeflags.find (' ', n); + if (pos != string::npos) + dup += makeflags.substr (pos); + skipped_makeflags = "MAKEFLAGS=" + dup; + error_msg + = "cannot access %<" + js_needle + "%> file descriptors"; + } + } + error_msg = "%<" + js_needle + "%> is not present in %<MAKEFLAGS%>"; + } + else + error_msg = "%<MAKEFLAGS%> environment variable is unset"; + + if (!error_msg.empty ()) + error_msg = "jobserver is not available: " + error_msg; +} diff --git a/gcc/opts-jobserver.h b/gcc/opts-jobserver.h new file mode 100644 index 00000000000..68ce188b84a --- /dev/null +++ b/gcc/opts-jobserver.h @@ -0,0 +1,44 @@ +/* GNU make's jobserver related functionality. + Copyright (C) 2022 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 3, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. + +See dbgcnt.def for usage information. */ + +#ifndef GCC_JOBSERVER_H +#define GCC_JOBSERVER_H + +using namespace std; + +struct jobserver_info +{ + /* Default constructor. */ + jobserver_info (); + + /* Error message if there is a problem. */ + string error_msg = ""; + /* Skipped MAKEFLAGS where --jobserver-auth is skipped. */ + string skipped_makeflags = ""; + /* File descriptor for reading used for jobserver communication. */ + int rfd = -1; + /* File descriptor for writing used for jobserver communication. */ + int wfd = -1; + /* Return true if jobserver is active. */ + bool is_active = false; +}; + +#endif /* GCC_JOBSERVER_H */ -- 2.37.2 From 53e3b2bf16a486c15c20991c6095f7be09012b55 Mon Sep 17 00:00:00 2001 From: Martin Liska <mliska@suse.cz> Date: Tue, 9 Aug 2022 13:59:36 +0200 Subject: [PATCH 2/3] lto: support --jobserver-style=fifo for recent GNU make gcc/ChangeLog: * opts-jobserver.h: Add one member. * opts-common.cc (jobserver_info::jobserver_info): Parse FIFO format of --jobserver-auth. --- gcc/opts-common.cc | 17 +++++++++++++++-- gcc/opts-jobserver.h | 2 ++ 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/gcc/opts-common.cc b/gcc/opts-common.cc index 4d4f424df13..c2993f9140a 100644 --- a/gcc/opts-common.cc +++ b/gcc/opts-common.cc @@ -2010,8 +2010,14 @@ void prepend_xassembler_to_collect_as_options (const char *collect_as_options, jobserver_info::jobserver_info () { + /* Traditionally, GNU make uses opened pipes for jobserver-auth, + e.g. --jobserver-auth=3,4. + Starting with GNU make 4.4, one can use --jobserver-style=fifo + and then named pipe is used: --jobserver-auth=fifo:/tmp/hcsparta. */ + /* Detect jobserver and drop it if it's not working. */ string js_needle = "--jobserver-auth="; + string fifo_prefix = "fifo:"; const char *envval = getenv ("MAKEFLAGS"); if (envval != NULL) @@ -2020,8 +2026,15 @@ jobserver_info::jobserver_info () size_t n = makeflags.rfind (js_needle); if (n != string::npos) { - if (sscanf (makeflags.c_str () + n + js_needle.size (), - "%d,%d", &rfd, &wfd) == 2 + string ending = makeflags.substr (n + js_needle.size ()); + if (ending.find (fifo_prefix) == 0) + { + ending = ending.substr (fifo_prefix.size ()); + pipe_path = ending.substr (0, ending.find (' ')); + is_active = true; + } + else if (sscanf (makeflags.c_str () + n + js_needle.size (), + "%d,%d", &rfd, &wfd) == 2 && rfd > 0 && wfd > 0 && is_valid_fd (rfd) diff --git a/gcc/opts-jobserver.h b/gcc/opts-jobserver.h index 68ce188b84a..98ea2579962 100644 --- a/gcc/opts-jobserver.h +++ b/gcc/opts-jobserver.h @@ -37,6 +37,8 @@ struct jobserver_info int rfd = -1; /* File descriptor for writing used for jobserver communication. */ int wfd = -1; + /* Named pipe path. */ + string pipe_path = ""; /* Return true if jobserver is active. */ bool is_active = false; }; -- 2.37.2 From fed766af32ed6cd371016cc24e931131e19b4eb1 Mon Sep 17 00:00:00 2001 From: Martin Liska <mliska@suse.cz> Date: Tue, 9 Aug 2022 13:59:39 +0200 Subject: [PATCH 3/3] lto: respect jobserver in parallel WPA streaming PR lto/106328 gcc/ChangeLog: * opts-jobserver.h (struct jobserver_info): Add pipefd. (jobserver_info::connect): New. (jobserver_info::disconnect): Likewise. (jobserver_info::get_token): Likewise. (jobserver_info::return_token): Likewise. * opts-common.cc: Implement the new functions. gcc/lto/ChangeLog: * lto.cc (wait_for_child): Decrement nruns once a process finishes. (stream_out_partitions): Use job server if active. (do_whole_program_analysis): Likewise. --- gcc/lto/lto.cc | 58 +++++++++++++++++++++++++++++++++----------- gcc/opts-common.cc | 40 ++++++++++++++++++++++++++++++ gcc/opts-jobserver.h | 14 +++++++++++ 3 files changed, 98 insertions(+), 14 deletions(-) diff --git a/gcc/lto/lto.cc b/gcc/lto/lto.cc index 31b0c1862f7..c82307f4f7e 100644 --- a/gcc/lto/lto.cc +++ b/gcc/lto/lto.cc @@ -18,6 +18,7 @@ You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ +#define INCLUDE_STRING #include "config.h" #include "system.h" #include "coretypes.h" @@ -54,11 +55,17 @@ along with GCC; see the file COPYING3. If not see #include "attribs.h" #include "builtins.h" #include "lto-common.h" +#include "opts-jobserver.h" - -/* Number of parallel tasks to run, -1 if we want to use GNU Make jobserver. */ +/* Number of parallel tasks to run. */ static int lto_parallelism; +/* Number of active WPA streaming processes. */ +static int nruns = 0; + +/* GNU make's jobserver info. */ +static jobserver_info *jinfo = NULL; + /* Return true when NODE has a clone that is analyzed (i.e. we need to load its body even if the node itself is not needed). */ @@ -205,6 +212,12 @@ wait_for_child () "streaming subprocess was killed by signal"); } while (!WIFEXITED (status) && !WIFSIGNALED (status)); + + --nruns; + + /* Return token to the jobserver if active. */ + if (jinfo != NULL && jinfo->is_active) + jinfo->return_token (); } #endif @@ -228,25 +241,35 @@ stream_out_partitions (char *temp_filename, int blen, int min, int max, bool ARG_UNUSED (last)) { #ifdef HAVE_WORKING_FORK - static int nruns; - if (lto_parallelism <= 1) { stream_out_partitions_1 (temp_filename, blen, min, max); return; } - /* Do not run more than LTO_PARALLELISM streamings - FIXME: we ignore limits on jobserver. */ if (lto_parallelism > 0 && nruns >= lto_parallelism) - { - wait_for_child (); - nruns --; - } + wait_for_child (); + /* If this is not the last parallel partition, execute new streaming process. */ if (!last) { + if (jinfo != NULL && jinfo->is_active) + while (true) + { + if (jinfo->get_token ()) + break; + if (nruns > 0) + wait_for_child (); + else + { + /* There are no free tokens, lets do the job outselves. */ + stream_out_partitions_1 (temp_filename, blen, min, max); + asm_nodes_output = true; + return; + } + } + pid_t cpid = fork (); if (!cpid) @@ -264,10 +287,12 @@ stream_out_partitions (char *temp_filename, int blen, int min, int max, /* Last partition; stream it and wait for all children to die. */ else { - int i; stream_out_partitions_1 (temp_filename, blen, min, max); - for (i = 0; i < nruns; i++) + while (nruns > 0) wait_for_child (); + + if (jinfo != NULL && jinfo->is_active) + jinfo->disconnect (); } asm_nodes_output = true; #else @@ -460,9 +485,14 @@ do_whole_program_analysis (void) lto_parallelism = 1; - /* TODO: jobserver communication is not supported, yet. */ if (!strcmp (flag_wpa, "jobserver")) - lto_parallelism = param_max_lto_streaming_parallelism; + { + jinfo = new jobserver_info (); + if (jinfo->is_active) + jinfo->connect (); + + lto_parallelism = param_max_lto_streaming_parallelism; + } else { lto_parallelism = atoi (flag_wpa); diff --git a/gcc/opts-common.cc b/gcc/opts-common.cc index c2993f9140a..5d79f174a38 100644 --- a/gcc/opts-common.cc +++ b/gcc/opts-common.cc @@ -2059,3 +2059,43 @@ jobserver_info::jobserver_info () if (!error_msg.empty ()) error_msg = "jobserver is not available: " + error_msg; } + +void +jobserver_info::connect () +{ + if (!pipe_path.empty ()) + pipefd = open (pipe_path.c_str (), O_RDWR); +} + +void +jobserver_info::disconnect () +{ + if (!pipe_path.empty ()) + { + gcc_assert (close (pipefd) == 0); + pipefd = -1; + } +} + +bool +jobserver_info::get_token () +{ + int fd = pipe_path.empty () ? rfd : pipefd; + char c; + unsigned n = read (fd, &c, 1); + if (n != 1) + { + gcc_assert (errno == EAGAIN); + return false; + } + else + return true; +} + +void +jobserver_info::return_token () +{ + int fd = pipe_path.empty () ? wfd : pipefd; + char c = 'G'; + gcc_assert (write (fd, &c, 1) == 1); +} diff --git a/gcc/opts-jobserver.h b/gcc/opts-jobserver.h index 98ea2579962..76c1d9b2882 100644 --- a/gcc/opts-jobserver.h +++ b/gcc/opts-jobserver.h @@ -29,6 +29,18 @@ struct jobserver_info /* Default constructor. */ jobserver_info (); + /* Connect to the server. */ + void connect (); + + /* Disconnect from the server. */ + void disconnect (); + + /* Get token from the server. */ + bool get_token (); + + /* Return token to the server. */ + void return_token (); + /* Error message if there is a problem. */ string error_msg = ""; /* Skipped MAKEFLAGS where --jobserver-auth is skipped. */ @@ -39,6 +51,8 @@ struct jobserver_info int wfd = -1; /* Named pipe path. */ string pipe_path = ""; + /* Pipe file descriptor. */ + int pipefd = -1; /* Return true if jobserver is active. */ bool is_active = false; }; -- 2.37.2 From 3f1c2f89f6b8b8d23a9072f8549b0a2c1de06b03 Mon Sep 17 00:00:00 2001 From: Martin Liska <mliska@suse.cz> Date: Tue, 16 Aug 2022 08:22:29 +0200 Subject: [PATCH] jobserver: fix fifo mode by opening pipe in proper mode The current jobserver_info relies on non-blocking FDs, thus one the pipe in such mode. gcc/ChangeLog: * opts-common.cc (jobserver_info::connect): Open fifo in non-blocking mode. --- gcc/opts-common.cc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/opts-common.cc b/gcc/opts-common.cc index 5d79f174a38..4dec9f94447 100644 --- a/gcc/opts-common.cc +++ b/gcc/opts-common.cc @@ -2064,7 +2064,7 @@ void jobserver_info::connect () { if (!pipe_path.empty ()) - pipefd = open (pipe_path.c_str (), O_RDWR); + pipefd = open (pipe_path.c_str (), O_RDWR | O_NONBLOCK); } void -- 2.37.2
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